Pigments derived from porphin: all are chelates with metals (Fe, Mg, Co, Zn, Cu, Ni). Constituents of haemoglobin, chlorophyll, cytochromes.
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A group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration to which a variety of side chains are attached. The nature of the side chain is indicated by a prefix, as uroporphyrin, haematoporphyrin, etc. The porphyrins, in combination with iron, form the haem component in biologica...Found on http://www.encyclo.co.uk/local/20973
A naturally occurring isomer of protoporphyrin demonstrating the typical porphyrin ring structure Water-soluble, nitrogen-containing organic compounds of great biological importance which are found in a variety of pigments, including hemoglobin, chlorophyll a and b, the cytochromes (concerned wi...Found on http://www.daviddarling.info/encyclopedia/P/porphyrin.html
Type: Term Pronunciation: pōr′fi-rinz Definitions: 1. Pigments widely distributed throughout nature (heme, bile pigments, cytochromes) consisting of four pyrroles joined in a ring (porphin) structure. They are substitution products of porphin (porphyrin) and comprise several varieties, differing for the most part in the side chains (meth...Found on http://www.medilexicon.com/medicaldictionary.php?t=71256
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